The static B-H relationship is a very important parameter, used in the characterization of magnetic materials. In the paper is presented a novel laboratory equipment that has an “8” figure shaped magnetic circuit, which is made from a negligible hysteresis soft alloy. The experimental set-up consists of two DC coils, in which the currents i1 and i2 are set, to obtain a null value of the magnetic flux in the median yoke that has an “O” shaped figure, with two AC coils. A stationary magnetic field inverse problem is solved, starting with a couple of DC currents (i1, i2) and a piecewise linear normal magnetization curve is computed. The nonlinearity of B-H relationship is treated by polarization fixed-point iterative method, while for each iteration the Green function is engaged. The static magnetization curve is compared, with the B-H relationship measured, using a high precision metrological device, on a toroidal sample made from the same material.
FiorilloF.DupreL.R.AppinoC. and RiettoA.M., Comprehensive model of magnetization curve hysteresis loops, and losses in any direction in grain-oriented Fe-Si, IEEE Trans. Magn.38 (2002), 1467–1976, doi:10.1109/20.999119.
2.
Magnetic materials – Part 2: Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame, IEC Standard Publication 60404-2 ed. 3.1, 2008.
3.
Magnetic materials – Part 3: Methods of measurement of the magnetic properties of electrical steel strip and sheet by means of a single sheet tester, IEC Standard Publication 60404-3 ed. 2.2, 2010.
4.
AppinoC.FerraraE.FiorilloF.RocchinoL.RagusaC.SievertJ., International comparison on SST and Epstein measurements in grain-oriented Fe-Si sheet steel, Int. J. Appl. Electrom.48 (2015), 123–133.
5.
FiorilloF., Measurements of magnetic materials, Metrologia47 (2010), 114–142.
6.
Manescu (Paltanea)V.PaltaneaG.GavrilaH. and PeterI., The influence of punching and laser cutting technologies on the magnetic properties of non-oriented silicon iron steels, in: IEEE ISFEE 2014, Bucharest, Romania, 2014.
7.
SchneiderJ.ReicheltS.StockerA.FachmannB. and KawallaR., Frequency dependence of magnetization behavior for FeSi materials with different thickness, IEEE Trans. Magn.48 (2012), 1429–1432.
8.
HantilaF., A method of solving magnetic field in nonlinear media, Rev. Roum. Sci. Techn., Electrotechn. et Energ.20 (1975), 397–407.
9.
Vacuumschmelze GmbH, Soft magnetic materials and semi-finished products, 2016.
10.
Manescu (Paltanea)V.PaltaneaG.GavrilaH. and NicolaideA., Analysis of the cutting area, obtained through mechanical and electrical discharge tehnologies in non oriented silicon iron sheets, Rev. Roum. Sci. Techn. – Electrotechn. Et. Energ.60 (2015), 143–152.
11.
HantilaF.PredaG. and VasiliuM., Polarization method for static fields, IEEE Trans. Magn.36 (2000), 672–675.
12.
OwzareckM., Measurement method for normal magnetization curve of soft magnetic composites with high magnetization currents, Int. J. Appl. Electrom.48 (2015), 181–186.
13.
HantilaF. and GramaG., An overrelaxation method for the computation of the fixed point of a contractive mapping, Rev. Roum. Sci. Techn. – Electrotechn. Et. Energ.27 (1982), 395–398.
14.
CiricI.R.HantilaF.MaricaruM. and MarinescuS., Efficient iterative integral technique for computation of fields in electric machines with rotor eccentricity, IEEE Trans. Magn.48 (2012), 1015–1018.
15.
PredaG. and HantilaF., Nonlinear integral formulation and neural network-based solution for reconstruction of deep defects with pulse eddy currents, IEEE Trans. Magn.50 (2014), 7002604.
16.
MinciunescuP., Contributions to integral equation method for 3D magnetostatic problems, IEEE Trans. Magn.34 (1998), 2461–2464.
17.
MinciunescuP., Boundary element method in reduction of cogging torque, IEEE Trans. Magn.34 (1998), 2905–2907.
18.
HantilaF., Mathematical models of the relation between B and H for nonlinear media, Rev. Roum. Sci. Techn., Electrotechn. et Energ.19 (1974), 429–448.
19.
CiricI.R.MaghiarT.HantilaF. and IfrimC., Error bounds for the FEM numerical solution of nonlinear field problems, COMPEL23 (2004), 835–844.
20.
de la BarriereO.AppinoC.FiorilloF.RagusaC.LecrivainM.RocchinoL., Characterization and prediction of magnetic losses in soft magnetic composites under distorted induction waveform, IEEE Trans. Magn.49 (2013), 1318–1326.
